#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

from six.moves.urllib import parse as urlparse

from heat.engine import clients
from heat.engine import constraints
from heat.engine import properties
from heat.engine import resource
from heat.openstack.common import log as logging

logger = logging.getLogger(__name__)


class S3Bucket(resource.Resource):

    PROPERTIES = (
        ACCESS_CONTROL, WEBSITE_CONFIGURATION, TAGS,
    ) = (
        'AccessControl', 'WebsiteConfiguration', 'Tags',
    )

    _WEBSITE_CONFIGURATION_KEYS = (
        WEBSITE_CONFIGURATION_INDEX_DOCUMENT,
        WEBSITE_CONFIGURATION_ERROR_DOCUMENT,
    ) = (
        'IndexDocument',
        'ErrorDocument',
    )

    _TAG_KEYS = (
        TAG_KEY, TAG_VALUE,
    ) = (
        'Key', 'Value',
    )

    properties_schema = {
        ACCESS_CONTROL: properties.Schema(
            properties.Schema.STRING,
            _('A predefined access control list (ACL) that grants '
              'permissions on the bucket.'),
            constraints=[
                constraints.AllowedValues(['Private', 'PublicRead',
                                           'PublicReadWrite',
                                           'AuthenticatedRead',
                                           'BucketOwnerRead',
                                           'BucketOwnerFullControl']),
            ]
        ),
        WEBSITE_CONFIGURATION: properties.Schema(
            properties.Schema.MAP,
            _('Information used to configure the bucket as a static website.'),
            schema={
                WEBSITE_CONFIGURATION_INDEX_DOCUMENT: properties.Schema(
                    properties.Schema.STRING,
                    _('The name of the index document.')
                ),
                WEBSITE_CONFIGURATION_ERROR_DOCUMENT: properties.Schema(
                    properties.Schema.STRING,
                    _('The name of the error document.')
                ),
            }
        ),
        TAGS: properties.Schema(
            properties.Schema.LIST,
            _('Tags to attach to the bucket.'),
            schema=properties.Schema(
                properties.Schema.MAP,
                schema={
                    TAG_KEY: properties.Schema(
                        properties.Schema.STRING,
                        _('The tag key name.'),
                        required=True
                    ),
                    TAG_VALUE: properties.Schema(
                        properties.Schema.STRING,
                        _('The tag value.'),
                        required=True
                    ),
                },
            )
        ),
    }

    attributes_schema = {
        'DomainName': _('The DNS name of the specified bucket.'),
        'WebsiteURL': _('The website endpoint for the specified bucket.')
    }

    def tags_to_headers(self):
        if self.properties[self.TAGS] is None:
            return {}
        return dict(
            ('X-Container-Meta-S3-Tag-' + tm[self.TAG_KEY], tm[self.TAG_VALUE])
            for tm in self.properties[self.TAGS])

    def handle_create(self):
        """Create a bucket."""
        container = self.physical_resource_name()
        headers = self.tags_to_headers()
        logger.debug('S3Bucket create container %(container)s with headers '
                     '%(headers)s' % {
                         'container': container, 'headers': headers})
        if self.properties[self.WEBSITE_CONFIGURATION] is not None:
            sc = self.properties[self.WEBSITE_CONFIGURATION]
            index_doc = sc[self.WEBSITE_CONFIGURATION_INDEX_DOCUMENT]
            error_doc = sc[self.WEBSITE_CONFIGURATION_ERROR_DOCUMENT]
            # we will assume that swift is configured for the staticweb
            # wsgi middleware
            headers['X-Container-Meta-Web-Index'] = index_doc
            headers['X-Container-Meta-Web-Error'] = error_doc

        con = self.context
        ac = self.properties[self.ACCESS_CONTROL]
        tenant_username = '%s:%s' % (con.tenant, con.username)
        if ac in ('PublicRead', 'PublicReadWrite'):
            headers['X-Container-Read'] = '.r:*'
        elif ac == 'AuthenticatedRead':
            headers['X-Container-Read'] = con.tenant
        else:
            headers['X-Container-Read'] = tenant_username

        if ac == 'PublicReadWrite':
            headers['X-Container-Write'] = '.r:*'
        else:
            headers['X-Container-Write'] = tenant_username

        self.swift().put_container(container, headers)
        self.resource_id_set(container)

    def handle_delete(self):
        """Perform specified delete policy."""
        logger.debug('S3Bucket delete container %s' % self.resource_id)
        if self.resource_id is not None:
            try:
                self.swift().delete_container(self.resource_id)
            except clients.swiftclient.ClientException as ex:
                logger.warn(_("Delete container failed: %s") % ex)

    def FnGetRefId(self):
        return unicode(self.resource_id)

    def _resolve_attribute(self, name):
        url = self.swift().get_auth()[0]
        parsed = list(urlparse.urlparse(url))
        if name == 'DomainName':
            return parsed[1].split(':')[0]
        elif name == 'WebsiteURL':
            return '%s://%s%s/%s' % (parsed[0], parsed[1], parsed[2],
                                     self.resource_id)


def resource_mapping():
    if clients.swiftclient is None:
        return {}

    return {
        'AWS::S3::Bucket': S3Bucket,
    }
